Malicious PDF — malware analysis report

Static analysis result for SHA-256 4220cbf25c12a7be…

MALICIOUS

PDF

78.4 KB Created: 2021-05-03 08:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4858ef93036b2f38c84d8a256f7b5632 SHA-1: 4735690aa9223dca8e3f3a59ae3970975ddb305f SHA-256: 4220cbf25c12a7be383f46c17b80d58a5e17f4f5ff993e7dfc8501ca12ff49c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text suggesting it's a lure, and an embedded URI points to 'maypoin.ru', a domain associated with malicious activity. This indicates the file is likely part of a phishing campaign designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=how+do+you+change+the+battery+in+a+timex+ironman+watch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60388fdf67a8e.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/hjeAhfG/cisco_esa_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_60469eea202fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6010c511c1f06.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/i9jjieK/515649682.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/abs_academic_journal_guide_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_605a1b6da084e.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/tovenametowozok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5fc9325d9455f.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/honeywell_vista_128bp_installation_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36b7ca45-92ac-4362-b906-b7ec5e831f39/90857433018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c9150f-b13d-4ae9-9f39-08af18e48c4b/forgotten_realms_series_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6cdfa2-3f5e-4a8b-98d8-7c0b6a3805d3/ms_excel_2007_practical_exercises_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e52ed6b-9513-4302-a495-7393516cc523/12735725.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/american_disabilities_act_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/kidney_diet_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198d3864-9f3e-44bb-bfdc-fef58d977256/how_much_do_construction_companies_spend_on_safety.pdfIn PDF document text
    • http://lavoxema.onlinewebshop.net/sekuloxanidikesejeruwonix.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/87892758635.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5388 bytes
SHA-256: 676acfa3f54d0e266ff97347b2124f60852acc5372bbd72dd2233710103ebe61
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 10792 bytes
SHA-256: a2c69a570e75705bcaf26d8be3f98ed2af2e26226b04ce9e2506a31c15c6d540
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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